Which one of the following can be used to test the characteristics of an OFC?

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 2
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  1. OTMM (Optical Transceiver Monitoring Module)
  2. DTDR (Digital Time Domain Reflectometer)
  3. OTDR (Optical Time Domain Reflectometer)
  4. OFCM (Optical Fiber Communication Module)

Answer (Detailed Solution Below)

Option 3 : OTDR (Optical Time Domain Reflectometer)
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  • The Optical Time Domain Reflectometer (OTDR) is useful for testing the integrity of fiber optic cables (OFC).
  • It can verify splice loss, measure the length, and find faults.
  • The OTDR is also commonly used to create a "picture" of fiber optic cable when it is newly installed.
  • Later, comparisons can be made between the original trace and a second trace taken if problems arise.
  • The OTDR consists of a high power laser transmitter that sends a pulse of light down the fiber.
  • Back-scattered light and reflected light returns to the OTDR through the fiber and is directed to a sensitive receiver through a coupler in the OTDR front end.
  • For each measurement, the OTDR sends out a very high power pulse and measures the light coming back over time.
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